GPS refactored (#262)

- Refactored GPS service and HAL: GPS is no longer part of the HAL configuration. You can now add configure new GPS devices from the GPS settings app.
- T-Deck adds a boot hook to check if a GPS configuration exists and adds it when the config is empty.
- Implemented the concept of ObjectFile to read/write arrays of a raw data type (e.g. struct) to disk.
- Implemented more file utils (e.g. to create all directories of a path)

Documentation/gps.md

@@ -0,0 +1,27 @@
+# GPS Reference
+
+## Devices
+
+### Beitian BH-222Q
+
+115200 baud, U-Blox 10 clone, defaults to binary messages
+
+https://www.beitian.com/en/pd.jsp?id=1677
+
+### Beitian BN-357ZF
+
+9600 baud, L76K clone
+
+https://www.beitian.com/en/sys-pd/879.html
+
+### GY-GPS6MV2
+
+9600 baud, U-Blox 6 (original/clone)
+
+https://www.datasheethub.com/gy-neo6mv2-flight-control-gps-module/
+
+### M5Stack GPS
+
+9600 baud, AT6558 + MAX2659 (LNA)
+
+https://docs.m5stack.com/en/unit/gps